EP 1116186 A1 20010718 - COMPUTER CURVE CONSTRUCTION SYSTEM AND METHOD
Title (en)
COMPUTER CURVE CONSTRUCTION SYSTEM AND METHOD
Title (de)
RECHNERSYSTEM UND VERFAHREN ZUR KURVENKONSTRUKTION
Title (fr)
SYSTEME ET PROCEDE DE CONSTRUCTION DE COURBES SUR ORDINATEUR
Publication
Application
Priority
- US 9922285 W 19990924
- US 10192798 P 19980924
- US 10252398 P 19980930
Abstract (en)
[origin: WO0017819A1] A computer curve construction system and method for generating curves is shown. Each curve consists of several curve components, connected either with G<0> continuity, i.e continuity of points, G<1> continuity, i.e. continuity of points and tangent directions, or G<2> continuity, i.e. continuity of points, tangent directions, and curvatures. There are different types of curve components, in a first embodiment, for a peak-point curve, the features are start and end points, start and end tangent directions, and a peak point that defines the greatest distance between the curve and the chord, i.e. the connecting line segment between the start and end point. During or after constructing a curve it is possible to modify the curve by changing the position of a feature of any curve component. However there is one exception: if the curve component is connected with G<2> continuity at the start or end point, the peak point cannot be changed.
IPC 1-7
IPC 8 full level
G06T 11/20 (2006.01)
CPC (source: EP US)
G06T 11/203 (2013.01 - EP US)
Citation (search report)
See references of WO 0017819A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0017819 A1 20000330; AU 6265999 A 20000410; CA 2345464 A1 20000330; EP 1116186 A1 20010718; US 6441823 B1 20020827
DOCDB simple family (application)
US 9922285 W 19990924; AU 6265999 A 19990924; CA 2345464 A 19990924; EP 99949881 A 19990924; US 40571399 A 19990924